Finding the Fourth Proportional to 2,155.69, 2,975.17 and 1,316.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.69 : 2,975.17 = 1,316.88 : x
2. Step 2: Convert to fraction form
   2,155.69/2,975.17 = 1,316.88/x
3. Step 3: Cross multiply
   2,155.69x = 2,975.17 × 1,316.88
4. Step 4: Simplify right side
   2,155.69x = 3,917,930.29
5. Step 5: Solve for x
   x = 3,917,930.29/2,155.69
6. Step 6: Final answer
   x = 1,817.49